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• Quick Sum Calculator

  This online calculator sums up entered integer numbers. Any symbol what is not a digit, for example, a space, a comma, a semicolon, etc, serves as a separator. It is useful when you need to sum up several numbers but do not have speadsheet program at hand.

• Complex numbers

  The calculator displays complex number and its conjugate on the complex plane, evaluate complex number absolute value and principal value of the argument . It also demonstrates elementary operations on complex numbers.

• Gaps and missing numbers finder

  This online calculator helps you find gaps and missing numbers in a sequence of numbers.